Garmin 830 not compatible for GPX course?

Have been trying to add a course to my 830 via GC phone app but just won’t send. 

App is saying that the GPX file is not compatible with 830.... I’ve loaded these courses into my 820 without any issues. Screen shot attached  

Have tried the following:

  • Updated app on phone
  • Updated  firmware on 830
  • Removed and reconnected connections 
  • Full reset of 830 and started from scratch 

I have only need able to load a course manually via the computer cable connection  

Anyone else have the issue? Is there a cache file on the 830 that can be deleted or cleared? 

Thanks in advance